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EDIT :: dhclient-script.sh

#!/bin/sh PATH=/usr/sbin:/usr/bin:/sbin:/bin type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh type ip_to_var >/dev/null 2>&1 || . /lib/net-lib.sh # We already need a set netif here netif=$interface setup_interface() { ip=$new_ip_address mtu=$new_interface_mtu mask=$new_subnet_mask bcast=$new_broadcast_address gw=${new_routers%%,*} domain=$new_domain_name search=$(printf -- "$new_domain_search") namesrv=$new_domain_name_servers hostname=$new_host_name [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time [ -n "$new_max_life" ] && lease_time=$new_max_life preferred_lft=$lease_time [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life [ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override # Taken from debian dhclient-script: # The 576 MTU is only used for X.25 and dialup connections # where the admin wants low latency. Such a low MTU can cause # problems with UDP traffic, among other things. As such, # disallow MTUs from 576 and below by default, so that broken # MTUs are ignored, but higher stuff is allowed (1492, 1500, etc). if [ -n "$mtu" ] && [ $mtu -gt 576 ] ; then if ! ip link set $netif mtu $mtu ; then ip link set $netif down ip link set $netif mtu $mtu linkup $netif fi fi ip addr add $ip${mask:+/$mask} ${bcast:+broadcast $bcast} dev $netif \ ${lease_time:+valid_lft $lease_time} \ ${preferred_lft:+preferred_lft ${preferred_lft}} if [ -n "$gw" ] ; then if [ "$mask" = "255.255.255.255" ] ; then # point-to-point connection => set explicit route to gateway echo ip route add $gw dev $netif > /tmp/net.$netif.gw fi echo "$gw" | { IFS=' ' read -r main_gw other_gw echo ip route replace default via $main_gw dev $netif >> /tmp/net.$netif.gw if [ -n "$other_gw" ] ; then for g in $other_gw; do echo ip route add default via $g dev $netif >> /tmp/net.$netif.gw done fi } fi if getargbool 1 rd.peerdns; then [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf if [ -n "$namesrv" ] ; then for s in $namesrv; do echo nameserver $s done fi >> /tmp/net.$netif.resolv.conf fi # Note: hostname can be fqdn OR short hostname, so chop off any # trailing domain name and explicity add any domain if set. [ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname } setup_interface6() { domain=$new_domain_name search=$(printf -- "$new_dhcp6_domain_search") namesrv=$new_dhcp6_name_servers hostname=$new_host_name [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time [ -n "$new_max_life" ] && lease_time=$new_max_life preferred_lft=$lease_time [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life [ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \ dev ${netif} scope global \ ${lease_time:+valid_lft $lease_time} \ ${preferred_lft:+preferred_lft ${preferred_lft}} if getargbool 1 rd.peerdns; then [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf if [ -n "$namesrv" ] ; then for s in $namesrv; do echo nameserver $s done fi >> /tmp/net.$netif.resolv.conf fi # Note: hostname can be fqdn OR short hostname, so chop off any # trailing domain name and explicity add any domain if set. [ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname } parse_option_121() { while [ $# -ne 0 ]; do mask="$1" shift # Is the destination a multicast group? if [ $1 -ge 224 -a $1 -lt 240 ]; then multicast=1 else multicast=0 fi # Parse the arguments into a CIDR net/mask string if [ $mask -gt 24 ]; then destination="$1.$2.$3.$4/$mask" shift; shift; shift; shift elif [ $mask -gt 16 ]; then destination="$1.$2.$3.0/$mask" shift; shift; shift elif [ $mask -gt 8 ]; then destination="$1.$2.0.0/$mask" shift; shift elif [ $mask -gt 0 ]; then destination="$1.0.0.0/$mask" shift else destination="0.0.0.0/$mask" fi # Read the gateway gateway="$1.$2.$3.$4" shift; shift; shift; shift # Multicast routing on Linux # - If you set a next-hop address for a multicast group, this breaks with Cisco switches # - If you simply leave it link-local and attach it to an interface, it works fine. if [ $multicast -eq 1 -o "$gateway" = "0.0.0.0" ]; then temp_result="$destination dev $interface" else temp_result="$destination via $gateway dev $interface" fi echo "/sbin/ip route add $temp_result" done } case $reason in PREINIT) echo "dhcp: PREINIT $netif up" linkup $netif ;; PREINIT6) echo "dhcp: PREINIT6 $netif up" linkup $netif wait_for_ipv6_dad_link $netif ;; BOUND) echo "dhcp: BOND setting $netif" unset layer2 if [ -f /sys/class/net/$netif/device/layer2 ]; then read layer2 < /sys/class/net/$netif/device/layer2 fi if [ "$layer2" != "0" ]; then if command -v arping2 >/dev/null; then if arping2 -q -C 1 -c 2 -I $netif -0 $new_ip_address ; then warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying" exit 1 fi else if ! arping -f -q -D -c 2 -I $netif $new_ip_address ; then warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying" exit 1 fi fi fi unset layer2 setup_interface set | while read line || [ -n "$line" ]; do [ "${line#new_}" = "$line" ] && continue echo "$line" done >/tmp/dhclient.$netif.dhcpopts { echo '. /lib/net-lib.sh' echo "setup_net $netif" if [ -n "$new_classless_static_routes" ]; then OLDIFS="$IFS" IFS=".$IFS" parse_option_121 $new_classless_static_routes IFS="$OLDIFS" fi echo "source_hook initqueue/online $netif" [ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif" echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh" } > $hookdir/initqueue/setup_net_$netif.sh echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh >/tmp/net.$netif.up if [ -e /sys/class/net/${netif}/address ]; then > /tmp/net.$(cat /sys/class/net/${netif}/address).up fi ;; RENEW|REBIND) unset lease_time [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time [ -n "$new_max_life" ] && lease_time=$new_max_life preferred_lft=$lease_time [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life ip -4 addr change ${new_ip_address}/${new_subnet_mask} broadcast ${new_broadcast_address} dev ${interface} \ ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \ >/dev/null 2>&1 ;; BOUND6) echo "dhcp: BOND6 setting $netif" setup_interface6 set | while read line || [ -n "$line" ]; do [ "${line#new_}" = "$line" ] && continue echo "$line" done >/tmp/dhclient.$netif.dhcpopts { echo '. /lib/net-lib.sh' echo "setup_net $netif" echo "source_hook initqueue/online $netif" [ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif" echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh" } > $hookdir/initqueue/setup_net_$netif.sh echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh >/tmp/net.$netif.up if [ -e /sys/class/net/${netif}/address ]; then > /tmp/net.$(cat /sys/class/net/${netif}/address).up fi ;; RENEW6|REBIND6) unset lease_time [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time [ -n "$new_max_life" ] && lease_time=$new_max_life preferred_lft=$lease_time [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life ip -6 addr change ${new_ip6_address}/${new_ip6_prefixlen} dev ${interface} scope global \ ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \ >/dev/null 2>&1 ;; *) echo "dhcp: $reason";; esac exit 0

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